Stacking machine for safely producing high-alumina bricks and rotating safety facility positioning system thereof

Abstract

The invention discloses a stacking machine capable of safely producing high-alumina bricks and a rotary safety facility positioning system of the stacking machine, and belongs to the technical field of refractory material production equipment. The material conveying mechanism is arranged on the supporting frame and used for conveying the high-alumina bricks; and the rotary stacking mechanism is arranged on the supporting frame and used for rotary stacking of the high-alumina bricks, and the rotary stacking mechanism comprises a moving component, a position adjusting component, a rotary gear, a rotary rack and a rotary tray. According to the high-alumina brick stacking equipment with the rotary safety facility positioning function, through the use of the rotary stacking mechanism, after a platform is neatly arranged, a whole row of high-alumina bricks are pushed to a tray and are neatly placed, staggered arrangement is achieved through rotation of the tray at the bottom, a traditional fixed tray or mechanical arm repeated stacking mode is replaced, the situation that green bodies are not stably placed, and the production efficiency is improved is avoided. Simple and automatic stacking and placing are achieved, the stacking efficiency is remarkably improved, safe production is guaranteed, meanwhile, the mechanical complexity is reduced, and the rotating angle of the tray is controlled through gear transmission.

Description

Technical Field

[0001] The invention belongs to the technical field of refractory material production equipment, and in particular relates to a safe production high-alumina brick stacker and a rotating safety facility positioning system thereof. Background Art

[0002] High alumina bricks are a type of refractory material. The main component of this type of refractory brick is Al2O3. If the Al2O3 content is higher than 90%, it is called corundum brick. Due to different resources, the standards of different countries are not completely consistent. For example, European countries stipulate that the lower limit of Al2O3 content for high alumina refractories is 42%. In China, high alumina bricks are generally divided into three grades according to the Al2O3 content in the bricks: Grade I - Al2O3 content >75%; Grade II - Al2O3 content of 60% to 75%; Grade III - Al2O3 content of 48% to 60%.

[0003] Traditional devices rely on fixed pallets or robotic arms to grab and reduce personal injuries. They cannot dynamically adjust the stacking angle according to the weight of the bricks, resulting in low efficiency of staggered arrangement. Traditional stacking relies on manual arrangement or semi-automatic equipment, which is inefficient and costly. Ordinary pallets have no rotation function and only rely on robotic arms for repeated stacking. Summary of the Invention

[0004] The purpose of the present invention is to push the whole row of high-aluminum bricks onto the pallet after the platform is neatly arranged, and to arrange them neatly by rotating the bottom pallet to achieve staggered arrangement, replacing the traditional fixed pallet or repeated stacking method of the robotic arm, avoiding unstable placement of the blanks, and realizing simple automatic palletizing and placement, thereby significantly improving the palletizing efficiency and ensuring safe production. At the same time, the mechanical complexity is reduced, and the rotation angle of the pallet is controlled by gear transmission to replace the complex robotic arm structure, reducing the equipment footprint and maintenance cost. The invention is suitable for small and medium-sized high-aluminum brick production lines, and cooperates with infrared sensing to safely and accurately locate the position of the brick blanks in real time to ensure the accuracy of the staggered arrangement between layers. Improve work efficiency, obtain collision signals through collision sensors, determine the severity of the collision, and trigger different safety measures according to the severity, providing all-round safety protection for operators, and use infrared sensing technology to replace traditional visual systems or manual calibration to achieve real-time safety monitoring and dynamic correction of brick positions. Infrared technology has lower costs and is suitable for high-dust environments. The rotation angle of the pallet is controlled by a program, and the stacking mode is dynamically adjusted according to the weight and size of the bricks, solving the problem that traditional devices cannot adapt to bricks of different specifications, significantly improving stacking efficiency and stability, reducing equipment costs and maintenance difficulties, adapting to complex production environments, and promoting production line automation upgrades.

[0005] The technical solution adopted by the present invention is as follows: a safe production high-aluminum brick stacking machine and a rotating safety facility positioning system thereof, comprising:

[0006] Support frame;

[0007] The material conveying mechanism is installed on the support frame and is used to convey high-alumina bricks;

[0008] A rotary stacking mechanism is provided on a support frame for rotary stacking of high-alumina bricks. The rotary stacking mechanism includes a moving component, a positioning component, a rotating gear, a rotating rack and a rotating tray. A moving rotating seat is fixedly connected to one side of the bottom of the support frame. The moving component is provided in the moving rotating seat. The positioning component is provided in the moving rotating seat. The rotating rack is slidably connected in the moving rotating seat, and the rotating rack is connected to the positioning component. A rotating seat is provided on the moving component. The rotating tray is fixedly connected to the top of the rotating seat. The rotating gear is fixedly connected to the rotating seat, and the rotating gear and the rotating rack are meshed with each other; and

[0009] The discharging mechanism is arranged on the movable rotating seat and is used for discharging high-alumina bricks. The discharging mechanism includes a lifting component, two discharging cylinders and a discharging plate. The lifting component is arranged at one end of the movable rotating seat, and the two discharging cylinders are both arranged on the lifting component. The two ends of the discharging plate are respectively arranged on the two discharging cylinders.

[0010] Wherein, the material transmission mechanism includes a transmission frame and a material pushing component, the transmission frame is fixedly connected to the top of the support frame, and the material pushing component is arranged on the transmission frame.

[0011] Wherein, the pushing component includes a pushing block and a pushing track, the pushing track is fixedly connected to one side of the inner wall of the transmission frame, and the pushing block is slidably connected to the pushing track.

[0012] Among them, the moving part includes a moving control component, a moving synchronization component and a moving block, the moving block is slidably connected to the moving rotating seat, the moving control component is arranged in the moving rotating seat, and the moving control component is connected to the moving block, and the moving synchronization component is arranged on the moving control component.

[0013] Among them, the mobile control component includes two mobile screws and a mobile motor, the two mobile screws are rotatably connected to the mobile rotating seat, and the two mobile screws are threadedly connected to the mobile block, the mobile motor is fixedly connected to one end of the mobile rotating seat, and the output end of the mobile motor is fixedly connected to one end of one of the mobile screws.

[0014] Among them, the moving synchronization component includes two moving synchronization gears and a moving synchronization toothed belt, each of the moving synchronization gears is fixedly connected to one end of each moving screw, the moving synchronization toothed belt is sleeved on the two moving synchronization gears, and the moving synchronization toothed belt is engaged with the two moving synchronization gears.

[0015] Wherein, the positioning components are two positioning cylinders, the two positioning cylinders are respectively fixedly connected to the two ends of the movable rotating seat, and the output ends of the two positioning cylinders are respectively fixedly connected to the two ends of the rotating rack.

[0016] Among them, the lifting component includes a lifting control component, a lifting synchronization component and a stacking lifting plate. One end of the movable rotating seat is fixedly connected to the lifting frame, the stacking lifting plate is movably connected to the lifting frame, the lifting control component is arranged in the lifting frame, and the lifting control component is connected to the stacking lifting plate, and the lifting synchronization component is arranged on the lifting control component.

[0017] Among them, the lifting control component includes two lifting screws and a lifting motor. The two lifting screws are rotatably connected to the lifting frame, the lifting motor is fixedly connected to the lifting frame, and the output end of the lifting motor is fixedly connected to the bottom of one of the lifting screws.

[0018] Among them, the lifting synchronization component includes two lifting synchronization gears and a lifting synchronization belt. Each of the lifting synchronization gears is fixedly connected to one end of each lifting screw. The lifting synchronization belt is sleeved on the two lifting synchronization gears, and the lifting synchronization belt is engaged with the two lifting synchronization gears.

[0019] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are:

[0020] (1) In the present invention, by using a rotating stacking mechanism, after the platform is neatly arranged, the whole row of high-aluminum bricks are pushed onto the pallet and neatly placed. The bottom pallet is rotated to achieve staggered arrangement, replacing the traditional fixed pallet or repeated stacking method of the robotic arm, avoiding unstable placement of the blanks, and realizing simple automatic stacking and placement, which significantly improves the stacking efficiency and ensures safe production. At the same time, it reduces the mechanical complexity, uses gear transmission to control the rotation angle of the pallet, replaces the complex robotic arm structure, reduces the equipment footprint and maintenance costs, and is suitable for small and medium-sized high-aluminum brick production lines.

[0021] 2) In the present invention, infrared sensing is used to accurately and safely locate the position of bricks in real time, ensure the accuracy of the staggered arrangement between layers, improve work efficiency, obtain collision signals through collision sensors, determine the severity of the collision, and trigger different safety measures according to the severity, providing all-round safety protection for operators. Infrared sensing technology is used to replace traditional visual systems or manual calibration to achieve real-time safety monitoring and dynamic correction of brick positions. Infrared technology has lower costs and is suitable for high-dust environments. The rotation angle of the pallet is controlled by a program, and the stacking mode is dynamically adjusted according to the weight and size of the bricks, solving the problem that traditional devices cannot adapt to bricks of different specifications.

[0022] (3) The present invention significantly improves the efficiency and stability of palletizing, reduces equipment costs and maintenance difficulty, adapts to complex production environments, and promotes the automation upgrade of production lines. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a partial cross-sectional view of the present invention;

[0024] Figure 2 A perspective view of the present invention;

[0025] Figure 3 It is a three-dimensional diagram of the discharge mechanism of the present invention;

[0026] Figure 4 This is a cross-sectional exploded view of the rotary palletizing mechanism of the present invention;

[0027] Figure 5 It is an exploded view of the rotary palletizing mechanism of the present invention.

[0028] Markings in the figure: 1. Support frame; 2. Transfer frame; 3. Pushing block; 4. Pushing rail; 5. Lifting screw; 6. Lifting synchronous gear; 7. Lifting synchronous toothed belt; 8. Lifting frame; 9. Palletizing lifting plate; 10. Discharge cylinder; 11. Discharge plate; 12. Rotating pallet; 13. Moving synchronous toothed belt; 14. Lifting motor; 15. Moving block; 16. Moving screw; 17. Rotating rack; 18. Positioning cylinder; 19. Moving rotating seat; 20. Rotating gear; 21. Rotating seat; 22. Moving synchronous gear; 23. Moving motor. DETAILED DESCRIPTION

[0029] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0030] Example 1, refer to Figure 1-5 : A safe production high-alumina brick stacking machine and its rotating safety facility positioning system, including:

[0031] Support frame 1;

[0032] The material conveying mechanism is provided on the support frame 1 and is used for conveying high-alumina bricks;

[0033] A rotary stacking mechanism is provided on the support frame 1 for rotary stacking of high-alumina bricks. The rotary stacking mechanism includes a moving part, a positioning part, a rotating gear 20, a rotating rack 17 and a rotating tray 12. A moving rotating seat 19 is fixedly connected to one side of the bottom of the support frame 1. The moving part is provided in the moving rotating seat 19. The positioning part is provided in the moving rotating seat 19. The rotating rack 17 is slidably connected in the moving rotating seat 19, and the rotating rack 17 is connected to the positioning part. A rotating seat 21 is provided on the moving part. The rotating tray 12 is fixedly connected to the top of the rotating seat 21. The rotating gear 20 is fixedly connected to the rotating seat 21, and the rotating gear 20 and the rotating rack 17 are meshed with each other; and

[0034] The discharging mechanism is arranged on the movable rotating seat 19 and is used for discharging high-alumina bricks. The discharging mechanism includes a lifting component, two discharging cylinders 10 and a discharging plate 11. The lifting component is arranged at one end of the movable rotating seat 19, and the two discharging cylinders 10 are both arranged on the lifting component. The two ends of the discharging plate 11 are respectively arranged on the two discharging cylinders 10.

[0035] In this embodiment: the movement of the rotating seat 21 is controlled by the moving parts, and the rotating gear 20 and the rotating rack 17 cooperate with each other to realize the rotation of the rotating tray 12, complete the angle adjustment, ensure use, and improve the use effect. The models of the two discharging cylinders 10 can be selected from those available on the market as needed. I will not go into details here. The position of the discharging plate 11 is controlled by the two discharging cylinders 10 to complete the discharging. This device significantly improves the stacking efficiency and stability, and the efficiency is improved: the whole row pushing (14 pieces / time) is synchronized with the rotation of the pallet, which is more than 50% higher than the traditional robot arm's piece-by-piece grabbing efficiency, and anti-stacking optimization: the staggered arrangement increases the friction between layers to avoid the center of gravity offset problem caused by stacking in the same direction, especially suitable for high-aluminum bricks with larger dead weight, reducing equipment cost and maintenance difficulty, and simplifying the structure: the gear transmission and infrared sensing system reduce the cost of the robot arm solution by 30% to 40%, and convenient maintenance: reduce It relies on fewer precision components (such as servo motors and visual sensors), reduces failure rates and maintenance complexity, and is suitable for complex production environments. Environmental adaptability: infrared sensing technology is not affected by dust, and the safety performance of the visual system in harsh environments is limited. Flexibility is enhanced: the rotation angle can be adjusted by the program to adapt to bricks of different sizes, support multi-specification production needs, promote production line automation upgrades, and reduce manual dependence: the fully automatic process replaces traditional manual stacking, saving more than 70% of labor costs, reducing personal injuries, and ensuring safe production. Compatibility expansion: It can be seamlessly connected to the existing conveying platform without the need to modify the production line. The lifting components are equipped with infrared positioning and dynamic adjustment components, which are applications of existing technologies and will not be elaborated on here. Infrared sensing technology monitors the position of bricks in real time with an accuracy of ±2mm to ensure the neatness of stacking. The visual system is susceptible to dust interference. Infrared technology is more stable and reliable in highly polluted environments.

[0036] Specifically, the material transmission mechanism includes a transmission frame 2 and a material pushing component. The transmission frame 2 is fixedly connected to the top of the support frame 1 , and the material pushing component is provided on the transmission frame 2 .

[0037] In this embodiment, the transmission frame 2 is an application of the existing technology, which is used to move high-alumina bricks and complete the transmission.

[0038] Specifically, the pushing component includes a pushing block 3 and a pushing track 4 . The pushing track 4 is fixedly connected to one side of the inner wall of the transmission frame 2 , and the pushing block 3 is slidably connected to the pushing track 4 .

[0039] In this embodiment, the pushing block 3 moves on the pushing track 4 to control the position adjustment of the high-alumina brick.

[0040] Specifically: the moving parts include a moving control component, a moving synchronization component and a moving block 15. The moving block 15 is slidably connected to the moving rotating seat 19. The moving control component is arranged in the moving rotating seat 19, and the moving control component is connected to the moving block 15. The moving synchronization component is arranged on the moving control component.

[0041] In this embodiment, the rotating seat 21 rotates within the moving block 15 , and the moving block 15 controls the overall movement effect.

[0042] Specifically: the mobile control component includes two mobile screws 16 and a mobile motor 23. The two mobile screws 16 are rotatably connected to the mobile rotating seat 19, and the two mobile screws 16 are threadedly connected to the mobile block 15. The mobile motor 23 is fixedly connected to one end of the mobile rotating seat 19, and the output end of the mobile motor 23 is fixedly connected to one end of one of the mobile screws 16.

[0043] In this embodiment, the model of the moving motor 23 can be selected from those available on the market as needed, and no further details will be given here. The moving motor 23 controls the moving screw 16 to rotate, thereby completing the movement of the rotating base 21.

[0044] Specifically: the mobile synchronization component includes two mobile synchronization gears 22 and a mobile synchronization toothed belt 13, each mobile synchronization gear 22 is fixedly connected to one end of each mobile screw 16, the mobile synchronization toothed belt 13 is sleeved on the two mobile synchronization gears 22, and the mobile synchronization toothed belt 13 is engaged with the two mobile synchronization gears 22.

[0045] In this embodiment, the two moving synchronous gears 22 have the same size, and the two moving synchronous gears 22 are controlled to rotate synchronously by the moving synchronous belt 13, so that the two moving screws 16 rotate synchronously.

[0046] Specifically, the positioning components are two positioning cylinders 18 , which are fixedly connected to the two ends of the movable rotating seat 19 , and the output ends of the two positioning cylinders 18 are fixedly connected to the two ends of the rotating rack 17 .

[0047] In this embodiment, the model of the positioning cylinder 18 can be selected from those available on the market as needed, and will not be elaborated on here. By extending and retracting the positioning cylinder 18, the position of the rotating rack 17 is controlled to complete the docking and separation of the rotating rack 17 and the rotating gear 20.

[0048] Specifically: the lifting components include a lifting control component, a lifting synchronization component and a stacking lifting plate 9. One end of the movable rotating seat 19 is fixedly connected to the lifting frame 8. The stacking lifting plate 9 is movably connected to the lifting frame 8. The lifting control component is arranged in the lifting frame 8, and the lifting control component is connected to the stacking lifting plate 9. The lifting synchronization component is arranged on the lifting control component.

[0049] In this embodiment, the stacking lifting plate 9 controls the height of the high-aluminum bricks so that they move to the top of the rotating tray 12.

[0050] Specifically: the lifting control component includes two lifting screws 5 and a lifting motor 14. The two lifting screws 5 are rotatably connected to the lifting frame 8. The lifting motor 14 is fixedly connected to the lifting frame 8, and the output end of the lifting motor 14 is fixedly connected to the bottom of one of the lifting screws 5.

[0051] In this embodiment, the model of the lifting motor 14 can be selected from those available on the market as needed, and no further details will be given here. The lifting motor 14 is used to control one of the lifting screws 5 to rotate.

[0052] Specifically: the lifting synchronization component includes two lifting synchronization gears 6 and a lifting synchronization belt 7. Each lifting synchronization gear 6 is fixedly connected to one end of each lifting screw 5. The lifting synchronization belt 7 is sleeved on the two lifting synchronization gears 6, and the lifting synchronization belt 7 is engaged with the two lifting synchronization gears 6.

[0053] In this embodiment, the two lifting synchronous gears 6 have the same size, and the lifting synchronous belt 7 controls the two lifting synchronous gears 6 to rotate synchronously, so that the two lifting screws 5 rotate synchronously.

[0054] During use, the high-aluminum bricks are placed on the transmission rack 2, and the pushing block 3 is moved on the pushing track 4 to control the position of the high-aluminum bricks so that the high-aluminum bricks are moved to the stacking lifting plate 9. The lifting motor 14 controls the rotation of the lifting screw 5, and the two lifting synchronous gears 6 and the lifting synchronous toothed belt 7 are rotated synchronously to control the lifting and lowering of the stacking lifting plate 9 and dock with the rotating pallet 12. The discharge cylinder 10 controls the movement of the discharge plate 11 to move the high-aluminum bricks to the rotating pallet 12. The moving motor 23 controls the rotation of the moving screw 16, and cooperates with the two moving synchronous gears 22 and the moving synchronous toothed belt 13 to make the two moving screws 16 rotate synchronously, so that the moving block 15 moves in the moving rotating seat 19, adjusts the position of the rotating pallet 12, and performs stacking in sequence. After one layer of stacking is completed, the positioning cylinder 18 controls the position of the rotating rack 17 so that the rotating rack 17 engages with the rotating gear 20. During the movement of the moving block 15, the angle of the rotating pallet 12 is adjusted. After completion, stacking is performed and the use is completed.

[0055] The control method of the present invention is to control by manually starting and closing the switch. The wiring diagram of the power element and the provision of power supply are common knowledge in the field, and the present invention is mainly used to protect mechanical devices. Therefore, the control method and wiring layout are no longer explained in detail in the present invention.

[0056] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A safe production high-alumina brick stacker and its rotating safety facility positioning system, characterized in that: include: Support frame (1); A material conveying mechanism is provided on the support frame (1) and is used for conveying high-alumina bricks; A rotary stacking mechanism is provided on a support frame (1) and is used for rotary stacking of high-aluminum bricks. The rotary stacking mechanism comprises a moving part, a positioning part, a rotating gear (20), a rotating rack (17) and a rotating tray (12). A moving rotating seat (19) is fixedly connected to one side of the bottom of the support frame (1). The moving part is provided in the moving rotating seat (19). The positioning part is provided in the moving rotating seat (19). The rotating rack (17) is slidably connected in the moving rotating seat (19), and the rotating rack (17) is connected to the positioning part. A rotating seat (21) is provided on the moving part. The rotating tray (12) is fixedly connected to the top of the rotating seat (21). The rotating gear (20) is fixedly connected to the rotating seat (21), and the rotating gear (20) and the rotating rack (17) are meshed with each other. as well as A discharge mechanism is provided on a movable rotary seat (19) for discharging high-aluminum bricks. The discharge mechanism comprises a lifting component, two discharge cylinders (10) and a discharge plate (11). The lifting component is provided at one end of the movable rotary seat (19), the two discharge cylinders (10) are both provided on the lifting component, and the two ends of the discharge plate (11) are respectively provided on the two discharge cylinders (10).

2. A safe production high-alumina brick stacker and its rotating safety facility positioning system according to claim 1, characterized in that: The material transmission mechanism comprises a transmission frame (2) and a material pushing component. The transmission frame (2) is fixedly connected to the top of the support frame (1), and the material pushing component is arranged on the transmission frame (2).

3. A safe production high-alumina brick stacker and its rotating safety facility positioning system according to claim 1, characterized in that: The pushing component comprises a pushing block (3) and a pushing track (4); the pushing track (4) is fixedly connected to one side of the inner wall of the transmission frame (2); and the pushing block (3) is slidably connected to the pushing track (4).

4. A safe production high-alumina brick stacker and its rotating safety facility positioning system as claimed in claim 1, characterized in that: The moving component comprises a moving control component, a moving synchronization component and a moving block (15); the moving block (15) is slidably connected to a moving rotating seat (19); the moving control component is arranged in the moving rotating seat (19), and the moving control component is connected to the moving block (15); and the moving synchronization component is arranged on the moving control component.

5. A safe production high-alumina brick stacker and its rotating safety facility positioning system as claimed in claim 1, characterized in that: The movement control assembly includes two moving screws (16) and a moving motor (23). The two moving screws (16) are both rotatably connected to the moving rotating seat (19), and the two moving screws (16) are both threadedly connected to the moving block (15). The moving motor (23) is fixedly connected to one end of the moving rotating seat (19), and the output end of the moving motor (23) is fixedly connected to one end of one of the moving screws (16).

6. A safe production high-alumina brick stacker and its rotating safety facility positioning system as claimed in claim 1, characterized in that: The moving synchronous assembly comprises two moving synchronous gears (22) and a moving synchronous toothed belt (13), each of the moving synchronous gears (22) is fixedly connected to one end of each moving screw (16), the moving synchronous toothed belt (13) is sleeved on the two moving synchronous gears (22), and the moving synchronous toothed belt (13) and the two moving synchronous gears (22) are meshed with each other.

7. A safe production high-alumina brick stacker and its rotating safety facility positioning system as claimed in claim 1, characterized in that: The positioning components are two positioning cylinders (18), which are respectively fixedly connected to the two ends of the movable rotating seat (19), and the output ends of the two positioning cylinders (18) are respectively fixedly connected to the two ends of the rotating rack (17).

8. The safe production high-alumina brick stacker and its rotating safety facility positioning system according to claim 1, characterized in that: The lifting component comprises a lifting control component, a lifting synchronization component and a stacking lifting plate (9); one end of the movable rotating seat (19) is fixedly connected to the lifting frame (8); the stacking lifting plate (9) is movably connected to the lifting frame (8); the lifting control component is arranged in the lifting frame (8), and the lifting control component is connected to the stacking lifting plate (9); and the lifting synchronization component is arranged on the lifting control component.

9. A safe production high-alumina brick stacker and its rotating safety facility positioning system as claimed in claim 1, characterized in that: The lifting control assembly comprises two lifting screws (5) and a lifting motor (14). The two lifting screws (5) are both rotatably connected to the lifting frame (8). The lifting motor (14) is fixedly connected to the lifting frame (8), and the output end of the lifting motor (14) is fixedly connected to the bottom of one of the lifting screws (5).

10. A safe production high-alumina brick stacker and its rotating safety facility positioning system as claimed in claim 1, characterized in that: The lifting synchronization component comprises two lifting synchronization gears (6) and a lifting synchronization toothed belt (7), each of the lifting synchronization gears (6) is fixedly connected to one end of each lifting screw (5), the lifting synchronization toothed belt (7) is sleeved on the two lifting synchronization gears (6), and the lifting synchronization toothed belt (7) and the two lifting synchronization gears (6) are meshed with each other.

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